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I'm glad I'm not the only one having issues about this. If the whole thing was not possible, or was cancelled, we'd think well it's a shame but re-think, stay in UK and let next year take care of itself.
For the first time I wish we'd booked a package. What I am finding annoying, after contacting BA is that our booking, for 5 people, at a (quite reasonable) cost of £450, is not transferable to anyone else if we opt to change it. But if we'd booked either a car, or accommodation with them, this classes as a package and their rules are that as long as one person on the booking travels, the others can be transferred. As this encompasses a flight, why can't they offer transfers on flights. Well the truth is they could, but they don't have to so they won't.
So far the vibes I'm getting from 2 of the kids is that they would be OK with a trip in the UK, and put off the gibraltar/spain until next year. Obviously we'd have to pay the higher price if flight prices are more next year, a situation that nobody can predict.
Currently I've offloaded the research about places to go in the UK, with the proviso that it's not a city, and not a very touristy place that is likely to be busy. We are going to have to go before September, as October may be cold in UK, so many places are obviously going to be extremely busy.
It is most certainly is a hard call. I think if flying could be even moderately bearable by then, I might be more inclined to give it a try, but I suspect it's not going to be. The thought of wearing a mask for 6+ hours and standing in line for an indefinite period fills me with horror to be honest.